I recently migrated from owncloud 3 to owncloud 4 for a few of the newest features (versioning, security, working ldap).

LDAP configuration
LDAP Basic
Host: IP or Resolvable DNS
Base: dc=DOMAIN,dc=TLD
Name: user@domain.tld
Password: password
User Login Filter: sAMAccountName=%uid
User List Filter: objectClass=user
Group Filter objectClass=group

Advanced
Port: 389
Case insensitive LDAP server checked
Display Name Field: sAMAccountName